Add packageManager fields for Corepack compat

[merrywhether]

Summary

For users with Yarn defaulted to >1 / Berry, setting up the repo will result in the creation of the .yarn/ directory, yarn.lock updates, and package.json edits. This change enables corepack users to automatically detect and use Yarn Classic with no effect on anyone else.

I targeted the latest version of Yarn Classic as a guess, since there were no engines entries to key off of. Happy to change this as desired.

How did you test this change?

Before this, running yarn in a fresh clone in either the root or compiler workspaces resulted in Yarn Berry making the above changes to the repo: 2000+ .yarn/cache entries, lockfile regeneration, and package.json formatting changes.

After this, yarn is handled by Yarn Classic as expected and no changes occur (and repo functions as expected).

[react-sizebot]

Comparing: 597ad74...85c57fb

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.66 kB	6.66 kB	=	1.82 kB	1.82 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	495.01 kB	495.01 kB	=	88.68 kB	88.68 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.67 kB	6.67 kB	=	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	499.81 kB	499.81 kB	=	89.36 kB	89.36 kB
facebook-www/ReactDOM-prod.classic.js	=	592.16 kB	592.16 kB	=	104.15 kB	104.15 kB
facebook-www/ReactDOM-prod.modern.js	=	568.39 kB	568.39 kB	=	100.55 kB	100.55 kB
test_utils/ReactAllWarnings.js	Deleted	64.26 kB	0.00 kB	Deleted	16.02 kB	0.00 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
test_utils/ReactAllWarnings.js	Deleted	64.26 kB	0.00 kB	Deleted	16.02 kB	0.00 kB

Generated by 🚫 dangerJS against 85c57fb

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